From the philosopher Aristotle, he propounded the belief that slaves were demonstrably inferior, a product of their environment and inherited characteristics. Greeks persuaded themselves that they who had the best environment and characteristics and the purest bloodline and were, therefore, born to rule. The lower class may had sold cloth they had made or other items and were retailers of food. For the middle class, they consisted of ¨professional men¨ who were merchants, contractors, manufacturers, managers, tradesmen, craftsmen, and artists. The entire ceramic industry was owned by the middle class. This working class made sure that the navy fleet was well-maintained, the empire was supported through heavy taxes, and the commercial supremacy of their town was well-kept. This is one of the reasons explained on how the Greek government, social class divisions, and military needs could co-exist. In society and government, lower class Athenians were able to improve their social position by obtaining land in the subject states. Pericles gave more governing power to bodies that represented the citizenship as a whole, known as the